#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main()
{
    int m = 0;
    while (scanf("%d", &m) != EOF)
    {
        int begin = 0;
        begin = m * m - m + 1;
        printf("%d", begin);
        for (int i = 1; i < m ; i++)
        {
            printf("+%d", begin + 2 * i);
        }
        printf("\n");
    }
    return 0;
}
